With iOS 12.1, Apple introduced a bunch of new features to its mobile devices like Group FaceTime and dozens of new emoji. But the company also elected to add a controversial new performance management feature to the iPhone 8, 8 Plus, and iPhone X.

For the uninitiated, back in December 2017, Apple confirmed that it would sometimes slow down older iPhones through a software update in order to prevent unexpected shutdowns. The result was that models like the iPhone 6, 6 Plus, 6S, 6S Plus, 7, and 7 Plus would often perform poorly after being updated to the newest version of iOS.